How to use python3 insted of python2.6 in centos

Hi,
I have centos 6.3 os.
python2.6 install allready.
i have install python3.0
if i installed any software it by defult used python2.6 as python.
but i want to use python3.0 as defulte python .
so how to do this. please give me some replay.
as possible as fast

if i installed any software it by defult used python2.6 as python.
but i want to use python3.0 as defulte python .

It’s not really recommended to change the distribution’s default version of Python because it might break system scripts. Typically you just add “#!/usr/bin/env python3” at the top of all those scripts that actually need Python 3.

However, “/usr/bin/python” is a symlink to the actual Python executable in all distributions I know, so changing that will change the default Python, as in (NB. mutatis mutandis):